updated service spec

app/assets/javascripts/boards/components/modal/footer.js

@@ -26,7 +26,8 @@ gl.issueBoards.ModalFooter = Vue.extend({
   },
   methods: {
     addIssues() {
-      const list = this.modal.selectedList || this.state.lists[1];
+      const firstListIndex = 1;
+      const list = this.modal.selectedList || this.state.lists[firstListIndex];
       const selectedIssues = ModalStore.getSelectedIssues();
       const issueIds = selectedIssues.map(issue => issue.globalId);
 

app/services/boards/lists/list_service.rb

@@ -2,7 +2,7 @@ module Boards
   module Lists
     class ListService < BaseService
       def execute(board)
-        board.lists.create(list_type: :backlog) unless board.lists.backlog.any?
+        board.lists.create(list_type: :backlog) unless board.lists.backlog.exists?
 
         board.lists
       end

spec/services/boards/lists/list_service_spec.rb

 require 'spec_helper'
 
 describe Boards::Lists::ListService, services: true do
+  let(:project) { create(:empty_project) }
+  let(:board) { create(:board, project: project) }
+  let(:label) { create(:label, project: project) }
+  let!(:list) { create(:list, board: board, label: label) }
+  let(:service) { described_class.new(project, double) }
+
   describe '#execute' do
-    it "returns board's lists" do
-      project = create(:empty_project)
-      board = create(:board, project: project)
-      label = create(:label, project: project)
-      list = create(:list, board: board, label: label)
+    context 'when the board has a backlog list' do
+      before do
+        create(:backlog_list, board: board)
+      end
+
+      it 'does not create a backlog list' do
+        service.execute(board)
+
+        expect(board.lists.merge(List.backlog)).to eq [board.backlog_list]
+      end
+
+      it "returns board's lists" do
+        expect(service.execute(board)).to eq [board.backlog_list, list, board.closed_list]
+      end
+    end
+
+    context 'when the board does not have a backlog list' do
+      it 'creates a backlog list' do
+        service.execute(board)
 
-      service = described_class.new(project, double)
+        expect(board.backlog_list).not_to be nil
+      end
 
-      expect(service.execute(board)).to eq [board.backlog_list, list, board.closed_list]
+      it "returns board's lists" do
+        expect(service.execute(board)).to eq [board.backlog_list, list, board.closed_list]
+      end
     end
   end
 end